Having if/else trouble while creating a C++ class - c++

Question

I'm having trouble with a homework assignment.
Everything works as expected except for the letter_grade part. I'm not getting any compile errors, but every time I run the program, the letter_grade is -858993460. I know it's probably something simple that I am overlooking, but I've hit a wall and am pretty much out of ideas.
#include <iostream>
#include <string>
using namespace std;
// Class Declaration
class StudentRecord
{
string id;
int A, B, C, D, F, grade;
float avg, exam1, exam2;
public:
void input();
void output();
void average();
void letter_grade();
};
// Gathering data
void StudentRecord::input()
{
cout << " Please enter your student ID: ";
cin >> id;
cout << "\n";
cout << " Enter your score for exam 1: ";
cin >> exam1;
cout << "\n";
cout << " Enter your score for exam 2: ";
cin >> exam2;
}
// Calculations
void StudentRecord::average()
{
avg = (exam1 + exam2) / 2;
}
void StudentRecord::letter_grade()
{
if ((avg >= 90) && (avg <= 100))
grade = A;
else if ((avg >= 80) && (avg < 90))
grade = B;
else if ((avg >= 70) && (avg < 80))
grade = C;
else if ((avg >= 60) && (avg < 70))
grade = D;
else (avg < 60);
grade = F;
}
// Output Data
void StudentRecord::output()
{
cout << "\n\n";
cout << " *** Student Record ***" << endl;
cout << "\n";
cout << " Student ID: " << id << endl;
cout << "\n";
cout << " Grade for exam 1: " << exam1 << endl;
cout << "\n";
cout << " Grade for exam 2: " << exam2 << endl;
cout << "\n";
cout << " Average for the class: " << avg << endl;
cout << "\n";
cout << " Letter grade for the class: " << grade << endl;
cout << "\n\n";
}
int main()
{
StudentRecord student;
student.input();
student.average();
student.letter_grade();
student.output();
system ("pause");
return 0;
}

Answer 1

You've declared integer variables named A, B, C, D, etc. That's not really what you want here. You want to declare grade as a char variable. You want to put the character 'A', 'B', etc. in that char variable.
Example:
grade = 'A';
That puts the character 'A' into the variable grade.
If you remove those variables A...F, change grade to be of type char, and then rewrite your if-else statement to assigned letters 'A', 'B', etc. to grade, that should do the trick.
Take note of those single quotes around the characters. Those tell C++ that the thing between the quotes is a character constant.

Answer 2

You are defining the "grade" values , A,B,C,D,F as integers. They are never initialized, so contain garbage in them. I think your intent was to print out a letter grade. In that case, you need to represent the values as strings, not numbers. Something like this:
char *A = "A";
char *B = "B";
etc.
The declaration of a variable is simply a label to identify a memory location ( simplified ). So, the name of the variable has no correlation to its value.